package com.king.common.utils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import com.king.common.constant.Constants;
import com.king.common.utils.text.Convert;
import com.king.common.utils.text.StringUtils;

/**
 * 客户端工具类
 * 
 * @author king
 */
public class ServletUtils {
	/**
	 * 获取String参数
	 */
	public static String getParameter(String name) {
		return getRequest().getParameter(name);
	}

	/**
	 * 获取String参数
	 */
	public static String getParameter(String name, String defaultValue) {
		return Convert.toStr(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name) {
		return Convert.toInt(getRequest().getParameter(name));
	}

	/**
	 * 获取Integer参数
	 */
	public static Integer getParameterToInt(String name, Integer defaultValue) {
		return Convert.toInt(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name) {
		return Convert.toBool(getRequest().getParameter(name));
	}

	/**
	 * 获取Boolean参数
	 */
	public static Boolean getParameterToBool(String name, Boolean defaultValue) {
		return Convert.toBool(getRequest().getParameter(name), defaultValue);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request
	 *            请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String[]> getParams(ServletRequest request) {
		final Map<String, String[]> map = request.getParameterMap();
		return Collections.unmodifiableMap(map);
	}

	/**
	 * 获得所有请求参数
	 *
	 * @param request
	 *            请求对象{@link ServletRequest}
	 * @return Map
	 */
	public static Map<String, String> getParamMap(ServletRequest request) {
		Map<String, String> params = new HashMap<>();
		for (Map.Entry<String, String[]> entry : getParams(request).entrySet()) {
			params.put(entry.getKey(), StringUtils.join(entry.getValue(), ","));
		}
		return params;
	}

	/**
	 * 获取request
	 */
	public static HttpServletRequest getRequest() {
		return getRequestAttributes().getRequest();
	}

	/**
	 * 获取response
	 */
	public static HttpServletResponse getResponse() {
		return getRequestAttributes().getResponse();
	}

	/**
	 * 获取session
	 */
	public static HttpSession getSession() {
		return getRequest().getSession();
	}

	public static ServletRequestAttributes getRequestAttributes() {
		RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
		return (ServletRequestAttributes) attributes;
	}

	/**
	 * 将字符串渲染到客户端
	 * 
	 * @param response
	 *            渲染对象
	 * @param string
	 *            待渲染的字符串
	 */
	public static void renderString(HttpServletResponse response, String string) {
		try {
			response.setStatus(200);
			response.setContentType("application/json");
			response.setCharacterEncoding("utf-8");
			response.getWriter().print(string);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 是否是Ajax异步请求
	 * 
	 * @param request
	 */
	public static boolean isAjaxRequest(HttpServletRequest request) {
		String accept = request.getHeader("accept");
		if (accept != null && accept.contains("application/json")) {
			return true;
		}

		String xRequestedWith = request.getHeader("X-Requested-With");
		if (xRequestedWith != null && xRequestedWith.contains("XMLHttpRequest")) {
			return true;
		}

		String uri = request.getRequestURI();
		if (StringUtils.inStringIgnoreCase(uri, ".json", ".xml")) {
			return true;
		}

		String ajax = request.getParameter("__ajax");
		return StringUtils.inStringIgnoreCase(ajax, "json", "xml");
	}

	/**
	 * 内容编码
	 * 
	 * @param str
	 *            内容
	 * @return 编码后的内容
	 */
	public static String urlEncode(String str) {
		try {
			return URLEncoder.encode(str, Constants.UTF8);
		} catch (UnsupportedEncodingException e) {
			return StringUtils.EMPTY;
		}
	}

	/**
	 * 内容解码
	 * 
	 * @param str
	 *            内容
	 * @return 解码后的内容
	 */
	public static String urlDecode(String str) {
		try {
			return URLDecoder.decode(str, Constants.UTF8);
		} catch (UnsupportedEncodingException e) {
			return StringUtils.EMPTY;
		}
	}
	
    /**
     * 获取浏览器类型
     *
     * @param request
     * @return IE9: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0) FireFox: Mozilla/5.0 (Windows
     * NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 360:Mozilla/5.0 (Windows NT 6.1; WOW64)
     * AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36 IE10: Mozilla/5.0 (compatible;
     * MSIE 10.0; Windows NT 6.1; WOW64; Trident/6.0) google: Mozilla/5.0 (Windows NT 6.1; WOW64)
     * AppleWebKit/537.36 (KHTML, like Gecko) Chrome/38.0.2125.104 Safari/537.36
     */
    public static String getExplorerType(HttpServletRequest request) {
        try {
            String agent = request.getHeader("User-Agent");
            if (StringUtils.isBlank(agent))
                return null;
            if (agent.contains("MSIE")) {
                return agent.split(";")[1];
            } else if (agent.contains("Firefox")) {
                return "Firefox";
            } else if (agent.contains("Chrome")) {
                return "Chrome";
            }
            return "其他";
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    
    public static String encode(String fileName, String encode) {
        String name = null;
        try {
            name = URLEncoder.encode(fileName, encode);
            name = name.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return name;
    }
}
